The Protege 2.0L has a dedicated following in the track day community, and standalone ECU support for it is genuinely rare.
The 2003 Mazda Protege 2.0L is a well-sorted, lightweight platform that responds well to tuning, but standalone ECU support is hard to find. The Tuned By Shawn Boomslang PNP Wiring Harness for the Haltech Nexus connects directly to your factory harness without any permanent modifications, giving the Haltech Nexus full standalone engine control. No cutting, no splicing, fully reversible.
Advantages
- Throttle response that's immediate and proportional, not filtered through factory logic
- Fuel and ignition timing calibrated precisely to your setup
- Idle stability that's consistent regardless of temperature
- Engine behavior that accurately reflects your modifications
- A proper tuning foundation for a platform that deserves it
Features
- Plug-and-play fitment for 2003 Mazda Protege 2.0L, manual transmission
- Compatible with Haltech Nexus R3, R5, S2, and S3 ECUs
- No cutting or splicing of factory wiring
- OEM-quality connectors, USA-built by Boomslang Fabrication
- Fully reversible, factory harness preserved
- For competition and off-road use
The Details
Built specifically for this vehicle's connector layout with OEM-spec connectors and correct wire gauge throughout. Your factory harness stays completely untouched and the car can return to stock at any time. The Haltech Nexus takes full engine control once installed, giving your tuner a clean vehicle-specific foundation to build a proper map from.
Kit Includes
- 1x Boomslang PNP wiring harness for 2003 Mazda Protege 2.0L
- Haltech Nexus ECU sold separately
Fitment
2003 Mazda Protege 2.0L, Manual Transmission.